JP2014118912A - Sealing device of fuel piping - Google Patents

Sealing device of fuel piping Download PDF

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Publication number
JP2014118912A
JP2014118912A JP2012275973A JP2012275973A JP2014118912A JP 2014118912 A JP2014118912 A JP 2014118912A JP 2012275973 A JP2012275973 A JP 2012275973A JP 2012275973 A JP2012275973 A JP 2012275973A JP 2014118912 A JP2014118912 A JP 2014118912A
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Japan
Prior art keywords
fuel pipe
cover
fuel
sealing device
fuel piping
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2012275973A
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Japanese (ja)
Inventor
Naotoshi Amano
直利 天野
Tsuneharu Tachikawa
恒春 立川
Haruki Tsunekawa
晴樹 恒川
Takayuki Adachi
隆幸 足立
Tokuyo Nakasako
篤洋 中迫
Kazutomi Tanaka
一臣 田中
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Volvo Truck Corp
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Volvo Lastvagnar AB
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Application filed by Volvo Lastvagnar AB filed Critical Volvo Lastvagnar AB
Priority to JP2012275973A priority Critical patent/JP2014118912A/en
Priority to PCT/JP2013/079314 priority patent/WO2014097749A1/en
Publication of JP2014118912A publication Critical patent/JP2014118912A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/02Sealings between relatively-stationary surfaces
    • F16J15/06Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00Casings, e.g. crankcases or frames
    • F02F7/006Camshaft or pushrod housings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14Arrangements of injectors with respect to engines; Mounting of injectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/02Sealings between relatively-stationary surfaces
    • F16J15/06Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/062Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L5/00Devices for use where pipes, cables or protective tubing pass through walls or partitions
    • F16L5/02Sealing
    • F16L5/025Sealing the pipe being movable
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L5/00Devices for use where pipes, cables or protective tubing pass through walls or partitions
    • F16L5/02Sealing
    • F16L5/10Sealing by using sealing rings or sleeves only
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00Cylinders; Cylinder heads 
    • F02F1/24Cylinder heads
    • F02F1/242Arrangement of spark plugs or injectors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device of fuel piping, which is attachable and detachable to/from fuel piping and besides, suppresses the leakage of lubrication oil to the outside.SOLUTION: The sealing device of the fuel piping includes a sealing member 160 spirally wound around the external periphery of the fuel piping which supplies fuel to an injector, and a cover 140 for blocking a through-hole of the fuel piping 120, the through-hole being formed in a cylinder head or a rocker cover. Inside the cover 140, there is formed a housing chamber 146 for housing the sealing member 160 wound around the external periphery of the fuel piping 120 while the sealing member is compressed into the axial direction and the radial direction of the fuel piping 120. Then, seal performance between the cover 140 and the sealing member 160 is secured by housing the sealing member 160 in the housing chamber 146 of the cover 140 in the compressed state, and the leakage of the lubrication oil to the outside from the cylinder head or the rocker cover is suppressed. Furthermore, since the sealing member 160 is merely wound around the fuel piping 120, the sealing member can be easily removed from the fuel piping 120.

Description

本発明は、インジェクタへ燃料を供給する燃料配管とシリンダヘッド又はロッカカバーとの間のシール性能を確保するシール装置に関する。   The present invention relates to a sealing device that ensures sealing performance between a fuel pipe that supplies fuel to an injector and a cylinder head or a rocker cover.

ディーゼルエンジンの燃料配管は、特開2007−85260号公報(特許文献1)に記載されるように、ロッカカバーに形成された貫通孔を貫通して、インジェクタに接続されている。ロッカカバーの内部には、吸気弁及び排気弁の動弁機構などが取り付けられているため、その潤滑油の飛沫などが充満している。このため、潤滑油飛沫の外部への飛散を抑制すべく、燃料配管とロッカカバーとの間には、シール部材(オイルシール)が配設されている。   As described in Japanese Patent Application Laid-Open No. 2007-85260 (Patent Document 1), a fuel pipe of a diesel engine passes through a through hole formed in a rocker cover and is connected to an injector. Since the inside of the rocker cover is provided with a valve operating mechanism of an intake valve and an exhaust valve, it is filled with splashes of the lubricating oil. For this reason, a seal member (oil seal) is provided between the fuel pipe and the rocker cover in order to suppress the splashing of the lubricant oil to the outside.

特開2007−85260号公報JP 2007-85260 A

ところで、コモンレール式のディーゼルエンジンでは、2000bar以上で燃焼室に燃料を噴射するため、インジェクタに燃料配管の一端が直接接続される構成が採用されている。この場合、燃料配管の両端にフレアナットが取り付けられており、その中間に後からシール部材を取り付けることができないため、軸方向にスリットが形成された、燃料配管に着脱可能な円筒形状のシール部材を使用することが考えられる。なお、シール部材を着脱可能とすべき理由は、経時変化によりシール部材が劣化し、所要のシール性能を維持できなくなるからである。しかしながら、軸方向にスリットが形成された円筒形状のシール部材は、例えば、温度上昇によってロッカカバーの内部圧力が上昇すると、スリットの合せ目から潤滑油が漏出してしまうおそれがある。   By the way, in a common rail type diesel engine, in order to inject fuel into a combustion chamber at 2000 bar or more, the structure by which one end of fuel piping is directly connected to an injector is employ | adopted. In this case, flare nuts are attached to both ends of the fuel pipe, and a sealing member cannot be attached later in the middle, so a cylindrical sealing member that is detachably attached to the fuel pipe with a slit formed in the axial direction Can be considered. The reason why the seal member should be detachable is that the seal member deteriorates due to changes over time, and the required sealing performance cannot be maintained. However, in the cylindrical sealing member in which the slit is formed in the axial direction, for example, when the internal pressure of the rocker cover increases due to a temperature rise, there is a possibility that the lubricating oil leaks from the slit joint.

そこで、本発明は、燃料配管に着脱可能であるにもかかわらず、シリンダヘッド又はロッカカバーから外部への潤滑油の漏出を抑制可能な、燃料配管のシール装置を提供することを目的とする。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fuel pipe sealing device capable of suppressing leakage of lubricating oil from a cylinder head or a rocker cover to the outside despite being detachable from the fuel pipe.

燃料配管のシール装置は、インジェクタに燃料を供給する燃料配管の外周に螺旋状に巻き回されるシール部材と、シリンダヘッド又はロッカカバーに形成された燃料配管の貫通孔を閉塞する閉塞部材と、を含む。そして、閉塞部材には、燃料配管の外周に巻き回されたシール部材を、燃料配管の軸方向及び径方向に圧縮状態で収容する収容室が形成されている。   A fuel pipe sealing device includes a seal member that is spirally wound around an outer periphery of a fuel pipe that supplies fuel to an injector, a blocking member that closes a through hole of the fuel pipe formed in a cylinder head or a rocker cover, including. The closing member is formed with a storage chamber for storing the seal member wound around the outer periphery of the fuel pipe in a compressed state in the axial direction and the radial direction of the fuel pipe.

本発明によれば、シール部材は、燃料配管の外周に巻き回されているだけであるので、燃料配管に対して容易に着脱することができる。また、シリンダヘッド又はロッカカバーの貫通孔を閉塞する閉塞部材は、燃料配管に巻き回されているシール部材を圧縮状態で収容しているため、シール部材が自然状態へと戻ろうとする復元力を利用して、燃料配管と閉塞部材との間のシール性能を確保する。このため、シリンダヘッド又はロッカカバーから外部への潤滑油の漏出を抑制できる。   According to the present invention, since the seal member is merely wound around the outer periphery of the fuel pipe, it can be easily attached to and detached from the fuel pipe. Further, since the closing member that closes the through hole of the cylinder head or the rocker cover accommodates the sealing member wound around the fuel pipe in a compressed state, the sealing member has a restoring force to return to the natural state. By utilizing this, the sealing performance between the fuel pipe and the closing member is ensured. For this reason, leakage of lubricating oil from the cylinder head or the rocker cover to the outside can be suppressed.

燃料配管のシール装置の一例を示す断面図である。It is sectional drawing which shows an example of the sealing apparatus of fuel piping. カバーの詳細を示し、(A)は上面図、(B)は縦断面図である。The detail of a cover is shown, (A) is a top view, (B) is a longitudinal cross-sectional view. シール部材の詳細を示し、(A)は斜視図、(B)は正面図である。The detail of a sealing member is shown, (A) is a perspective view, (B) is a front view. カバーの二分割構造を示し、(A)は上面図、(B)は縦断面図である。The cover is divided into two parts, (A) is a top view, and (B) is a longitudinal sectional view. 燃料配管のシール装置の他の例を示す断面図である。It is sectional drawing which shows the other example of the sealing apparatus of fuel piping.

以下、添付された図面を参照し、本発明を実施するための実施形態について詳述する。
図1は、ディーゼルエンジンのロッカカバーを貫通する燃料配管のシール装置の一例を示す。
Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an example of a fuel pipe sealing device that penetrates a rocker cover of a diesel engine.

ディーゼルエンジンのシリンダヘッド100には、図示しないピストンのキャビティに向けて燃料を噴射するインジェクタ110が取り付けられている。インジェクタ110は、例えば、コントロールユニットのインジェクタドライバからの駆動信号に応じてコイルが作動し、閉弁方向に付勢されているニードルバルブがリフトして燃料を噴射する電磁式の燃料噴射弁である。このため、インジェクタ110には、ニードルバルブの開弁時間に比例した燃料が噴射されるように、所定圧力に調圧された燃料が供給されている。   An injector 110 that injects fuel toward a piston cavity (not shown) is attached to a cylinder head 100 of the diesel engine. The injector 110 is, for example, an electromagnetic fuel injection valve in which a coil operates in response to a drive signal from an injector driver of a control unit, and a needle valve that is biased in a valve closing direction lifts and injects fuel. . For this reason, the fuel adjusted to a predetermined pressure is supplied to the injector 110 so that fuel proportional to the valve opening time of the needle valve is injected.

インジェクタ110の基端112、即ち、燃焼室を臨む先端114から最も離れた部分には、例えば、図示しないコモンレールから燃料が供給される燃料配管120の一端が接続されている。燃料配管120の両端は、バルジ加工などにより拡径部122が夫々形成され、拡径部122に挟まれた部分には、インジェクタ110及びコモンレールに着脱可能に接続するためのフレアナット124が取り付けられている。   For example, one end of a fuel pipe 120 to which fuel is supplied from a common rail (not shown) is connected to the base end 112 of the injector 110, that is, the portion farthest from the tip 114 facing the combustion chamber. Both ends of the fuel pipe 120 are formed with enlarged diameter portions 122 by bulging or the like, and flare nuts 124 are attached to portions sandwiched between the enlarged diameter portions 122 so as to be detachably connected to the injector 110 and the common rail. ing.

シリンダヘッド100の上面には、図示しない吸気弁及び排気弁の動弁機構、即ち、カムシャフト、ロッカアームなどを収容するロッカカバー130が締結されている。ロッカカバー130の上面には、燃料配管120を貫通させるための貫通孔132が形成されている。ロッカカバー130の貫通孔132は、閉塞部材の一例としてのカバー140により閉塞されている。   On the upper surface of the cylinder head 100, a valve operating mechanism (not shown) for an intake valve and an exhaust valve, that is, a rocker cover 130 for accommodating a camshaft, a rocker arm and the like is fastened. A through hole 132 for allowing the fuel pipe 120 to penetrate is formed on the upper surface of the rocker cover 130. The through hole 132 of the rocker cover 130 is closed by a cover 140 as an example of a closing member.

カバー140は、金属部材からなり、図2に示すように、ロッカカバー130の貫通孔132を閉塞する平板状の平板部142と、平板部142の上面から上方に突出しつつ燃料配管120が貫通する円筒形状の円筒部144と、が一体形成されたものである。平板部142は、平面視で略菱形をなし、その長手方向の両端に、カバー140をロッカカバー130に着脱可能に締結するボルト150を挿通する挿通孔142Aが夫々形成されている。また、円筒部144の内部には、燃料配管120の外周に螺旋状に巻き回された、例えば、ゴムなどの弾性部材からなるシール部材160を圧縮状態で収容する収容室146が形成されている。   The cover 140 is made of a metal member, and, as shown in FIG. A cylindrical part 144 having a cylindrical shape is integrally formed. The flat plate portion 142 has a substantially rhombus shape in plan view, and insertion holes 142A through which bolts 150 for detachably fastening the cover 140 to the rocker cover 130 are inserted at both ends in the longitudinal direction. In addition, in the cylindrical portion 144, a storage chamber 146 is formed that stores, in a compressed state, a seal member 160 that is wound around the outer periphery of the fuel pipe 120 and is made of an elastic member such as rubber. .

なお、カバー140は、図示の形状に限らず、ロッカカバー130の貫通孔132を閉塞可能であれば、如何なる形状をなしていてもよい。
シール部材160は、図3に示すように、自然状態(自然長の状態)で、螺旋状に巻き回されており、シリンダヘッド100側に位置する一端162は、端部に向かうにつれて外径が徐々に縮径するテーパ形状をなしている。シール部材160が自然状態で螺旋状に巻き回されていることで、これを燃料配管120に取り付ける作業を容易にすることができる。また、シール部材160の線材は、図3に示すように、その横断面が略矩形(四角形)をなしているが、単純な円形であってもよい。なお、シール部材160としては、図3に示す形状のものに限らず、例えば、自然状態で線状(紐状)をなしていてもよい。
The cover 140 is not limited to the shape shown in the figure, and may have any shape as long as the through hole 132 of the rocker cover 130 can be closed.
As shown in FIG. 3, the seal member 160 is wound in a spiral state in a natural state (natural length state), and the one end 162 located on the cylinder head 100 side has an outer diameter toward the end portion. The taper is gradually reduced in diameter. Since the seal member 160 is spirally wound in a natural state, an operation of attaching the seal member 160 to the fuel pipe 120 can be facilitated. Further, as shown in FIG. 3, the wire of the seal member 160 has a substantially rectangular (quadrangle) cross section, but may be a simple circle. The seal member 160 is not limited to the shape shown in FIG. 3, and may be linear (string-like) in a natural state, for example.

このようなシール部材160を収容するために、カバー140の収容室146は、図2(B)に示すように、ロッカカバー130に近い部分がシール部材160のテーパ形状に倣った形状、即ち、平板部142の底面に向かうにつれて徐々に縮径するテーパ形状に形成されている。従って、燃料配管120に巻き回されたシール部材160をカバー140の収容室146に収容するとき、収容室146のテーパ面によりシール部材160のテーパ面が上方に押圧されるので、シール部材160を軸方向に圧縮状態で収容室146に収容し易くなる。   In order to accommodate such a seal member 160, the accommodation chamber 146 of the cover 140 has a shape in which the portion close to the rocker cover 130 follows the taper shape of the seal member 160, as shown in FIG. It is formed in a tapered shape that gradually decreases in diameter toward the bottom surface of the flat plate portion 142. Therefore, when the sealing member 160 wound around the fuel pipe 120 is accommodated in the accommodating chamber 146 of the cover 140, the tapered surface of the sealing member 160 is pressed upward by the tapered surface of the accommodating chamber 146. It becomes easy to accommodate in the storage chamber 146 in a compressed state in the axial direction.

カバー140は、図4に示すように、燃料配管120の軸心を通る面、即ち、燃料配管120の軸心を通る縦断面で二分割可能に構成されている。また、カバー140の分割面、即ち、2つの部品の合わせ面には、相互に係合するピン148A及び係合孔148Bが夫々形成されている。従って、ロッカカバー130の貫通孔132を貫通した燃料配管120に、2つの部品からなるカバー140を後付けすることができる。このとき、カバー140の2つの部品は、ピン148Aと係合孔148Bとを係合することで、相互に位置決めをしつつ一体化されるので、これをロッカカバー130に締結するためのボルト150の本数を減らすことができる。   As shown in FIG. 4, the cover 140 is configured to be divided into two parts by a plane passing through the axis of the fuel pipe 120, that is, a longitudinal section passing through the axis of the fuel pipe 120. In addition, pins 148 </ b> A and engagement holes 148 </ b> B that are engaged with each other are formed on the split surface of the cover 140, that is, the mating surface of the two components. Therefore, the cover 140 made of two parts can be retrofitted to the fuel pipe 120 penetrating the through hole 132 of the rocker cover 130. At this time, the two parts of the cover 140 are integrated while positioning each other by engaging the pin 148A and the engagement hole 148B, so that the bolt 150 for fastening this to the rocker cover 130 is integrated. The number of can be reduced.

なお、ロッカカバー130とカバー140との間のシール性能を更に高める必要がある場合には、これらの間にガスケット(図示せず)を挟み込むようにすればよい。
ここで、かかるシール装置の作用及び効果について説明する。
In addition, when it is necessary to further improve the sealing performance between the rocker cover 130 and the cover 140, a gasket (not shown) may be sandwiched therebetween.
Here, the operation and effect of the sealing device will be described.

作業者は、燃料配管120の一端をロッカカバー130の貫通孔132からその内部に挿入すると共に、燃料配管120の他端をコモンレールの配管接続口に近づけ、フレアナット124を締め付けることにより、燃料配管120の両端をインジェクタ110及びコモンレールに接続する。また、作業者は、燃料配管120の外周の所定箇所に、螺旋状に巻き回されたシール部材160を取り付け、その外方から2つの部品からなるカバー140のピン148A及び係合孔148Bを係合する。このとき、カバー140の収容室146のテーパ面により、シール部材160のテーパ面が押圧されて圧縮されるので、シール部材160を軸方向に圧縮しつつ収容室146に容易に収容することができる。   The operator inserts one end of the fuel pipe 120 into the inside of the through hole 132 of the rocker cover 130, closes the other end of the fuel pipe 120 to the pipe connection port of the common rail, and tightens the flare nut 124, thereby Both ends of 120 are connected to the injector 110 and the common rail. In addition, the worker attaches a spirally wound seal member 160 to a predetermined location on the outer periphery of the fuel pipe 120, and engages the pin 148A and the engagement hole 148B of the cover 140 made of two parts from the outside. Match. At this time, since the taper surface of the seal member 160 is pressed and compressed by the taper surface of the storage chamber 146 of the cover 140, the seal member 160 can be easily stored in the storage chamber 146 while being compressed in the axial direction. .

次に、作業者は、カバー140の挿通孔142Aにボルト150を挿通し、その雄螺子をロッカカバー130の雌螺子に螺合することで、ロッカカバー130に対してカバー140を締結する。   Next, the operator inserts the bolt 150 into the insertion hole 142 </ b> A of the cover 140 and screws the male screw into the female screw of the rocker cover 130, thereby fastening the cover 140 to the rocker cover 130.

この状態では、燃料配管120の外周に螺旋状に巻き回されたシール部材160は、燃料配管120の軸方向及び径方向に圧縮された状態で、カバー140の収容室146に収容されている。このため、シール部材160が自然状態へと戻ろうとする復元力によって、軸方向に隣接するシール部材160の線材同志が密接に接合すると共に、シール部材160の線材が径方向に配置される燃料配管120の外周面とカバー140の収容室146の内周面に押圧される。よって、燃料配管120とカバー140とのシール性能を確保することができる。ここで、カバー140は二分割構造をなしているが、シール部材160が収容室146の内周面に押圧されているので、その合わせ面から潤滑油が漏出することはない。さらに、シール部材160は、燃料配管120から容易に取り外すことができるので、例えば、経時変化により劣化しても、これを容易に交換することができる。   In this state, the seal member 160 spirally wound around the outer periphery of the fuel pipe 120 is accommodated in the accommodation chamber 146 of the cover 140 while being compressed in the axial direction and the radial direction of the fuel pipe 120. For this reason, the fuel pipe in which the wire rods of the seal members 160 adjacent in the axial direction are closely joined by the restoring force that the seal member 160 tries to return to the natural state, and the wire rods of the seal member 160 are arranged in the radial direction The outer peripheral surface of 120 and the inner peripheral surface of the accommodation chamber 146 of the cover 140 are pressed. Therefore, the sealing performance between the fuel pipe 120 and the cover 140 can be ensured. Here, the cover 140 has a two-part structure. However, since the seal member 160 is pressed against the inner peripheral surface of the storage chamber 146, the lubricating oil does not leak from the mating surface. Furthermore, since the seal member 160 can be easily removed from the fuel pipe 120, for example, even if the seal member 160 deteriorates due to aging, it can be easily replaced.

一方、インジェクタ110から燃料配管120を取り外す場合には、次のようにすればよい。即ち、作業者は、カバー140をロッカカバー130に締結しているボルト150を取り外し、カバー140を上方に移動しつつその長手方向に引っ張る。このとき、シール部材160の付勢力よりも大きな力を作用させると、カバー140が2つの部品に分割し、燃料配管120からカバー140を取り外すことができる。そして、燃料配管120の外周からシール部材160を取り外すと共に、燃料配管120の両端に取り付けられているフレアナット124を緩めて、燃料配管120とインジェクタ110及びコモンレールとの接続を解除する。その後、燃料配管120を上方に移動させ、その一端をロッカカバー130から取り出す。   On the other hand, when the fuel pipe 120 is removed from the injector 110, the following may be performed. That is, the operator removes the bolt 150 that fastens the cover 140 to the rocker cover 130 and pulls the cover 140 in the longitudinal direction while moving the cover 140 upward. At this time, when a force larger than the urging force of the seal member 160 is applied, the cover 140 is divided into two parts, and the cover 140 can be removed from the fuel pipe 120. And while removing the sealing member 160 from the outer periphery of the fuel piping 120, the flare nut 124 attached to the both ends of the fuel piping 120 is loosened, and the connection between the fuel piping 120, the injector 110, and the common rail is released. Thereafter, the fuel pipe 120 is moved upward, and one end thereof is taken out from the rocker cover 130.

インジェクタ110は、その基端112ではなく、その側面から燃料配管120を接続するものもある。この場合には、図5に示すように、シリンダヘッド100の側面に、インジェクタ110の燃料供給口116を臨む貫通孔102を形成し、その開口にカバー140を取り付けるようにすればよい。なお、カバー140などは、先の実施形態と同様であるので、重複説明を避けるため、その説明は省略するものとする。必要があれば、先の実施形態の説明を参照されたい。   Some injectors 110 connect the fuel pipe 120 not from the base end 112 but from the side thereof. In this case, as shown in FIG. 5, a through hole 102 facing the fuel supply port 116 of the injector 110 may be formed on the side surface of the cylinder head 100, and a cover 140 may be attached to the opening. Since the cover 140 and the like are the same as those in the previous embodiment, the description thereof will be omitted to avoid redundant description. If necessary, refer to the description of the previous embodiment.

以上説明したシール装置は、コモンレール式でないディーゼルエンジンにも適用することができる。また、このシール装置は、ディーゼルエンジンに限らず、燃焼室に燃料を直接噴射する、筒内噴射式のガソリンエンジンにも適用することができる。   The sealing device described above can be applied to a diesel engine that is not a common rail type. Moreover, this sealing device can be applied not only to a diesel engine but also to an in-cylinder injection type gasoline engine that directly injects fuel into a combustion chamber.

100 シリンダヘッド
102 貫通孔
110 インジェクタ
120 燃料配管
130 ロッカカバー
132 貫通孔
140 カバー(閉塞部材)
146 収容室
148A ピン
148B 係合孔
160 シール部材
162 一端
DESCRIPTION OF SYMBOLS 100 Cylinder head 102 Through-hole 110 Injector 120 Fuel piping 130 Rocker cover 132 Through-hole 140 Cover (blocking member)
146 Storage chamber 148A Pin 148B Engagement hole 160 Seal member 162 One end

Claims (6)

インジェクタに燃料を供給する燃料配管の外周に螺旋状に巻き回されるシール部材と、
前記燃料配管の外周に巻き回された前記シール部材を、前記燃料配管の軸方向及び径方向に圧縮状態で収容する収容室を有し、シリンダヘッド又はロッカカバーに形成された前記燃料配管の貫通孔を閉塞する閉塞部材と、
を含むことを特徴とする燃料配管のシール装置。
A sealing member spirally wound around the outer periphery of a fuel pipe for supplying fuel to the injector;
The seal member wound around the outer periphery of the fuel pipe has a storage chamber for storing the seal member in a compressed state in the axial direction and the radial direction of the fuel pipe, and penetrates the fuel pipe formed in the cylinder head or the rocker cover. A closing member for closing the hole;
A fuel pipe sealing device comprising:
前記シール部材は、自然状態で、螺旋状に巻き回されている、
ことを特徴とする請求項1に記載の燃料配管のシール装置。
The sealing member is spirally wound in a natural state,
The fuel pipe sealing device according to claim 1.
前記シール部材の一端は、端部に向かうにつれて外径が徐々に縮径するテーパ形状をなしていると共に、
前記閉塞部材の前記収容室は、前記シリンダヘッド又は前記ロッカカバーに近い部分が前記シール部材のテーパ形状に倣った形状をなしている、
ことを特徴とする請求項2に記載の燃料配管のシール装置。
One end of the seal member has a tapered shape in which the outer diameter gradually decreases toward the end,
The accommodating chamber of the closing member has a shape in which a portion close to the cylinder head or the rocker cover follows the tapered shape of the seal member,
The fuel pipe sealing device according to claim 2, wherein:
前記閉塞部材は、前記燃料配管の軸心を通る面で二分割可能である、
ことを特徴とする請求項1〜請求項3のいずれか1つに記載の燃料配管のシール装置。
The closing member can be divided into two on a plane passing through the axis of the fuel pipe.
The fuel pipe sealing device according to any one of claims 1 to 3, wherein
前記閉塞部材の分割面には、相互に係合するピン及び係合孔が夫々形成されている、
ことを特徴とする請求項4に記載の燃料配管のシール装置。
Pins and engagement holes that are engaged with each other are formed on the dividing surface of the closing member, respectively.
The fuel pipe sealing device according to claim 4.
前記閉塞部材と前記シリンダヘッド又は前記ロッカカバーとの間にガスケットが挟まれている、
ことを特徴とする請求項1〜請求項5のいずれか1つに記載の燃料配管のシール装置。
A gasket is sandwiched between the closing member and the cylinder head or the rocker cover.
The fuel pipe sealing device according to any one of claims 1 to 5, wherein:
JP2012275973A 2012-12-18 2012-12-18 Sealing device of fuel piping Pending JP2014118912A (en)

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PCT/JP2013/079314 WO2014097749A1 (en) 2012-12-18 2013-10-29 Sealing device and sealing method for fuel pipe

Applications Claiming Priority (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190145518A1 (en) * 2017-11-16 2019-05-16 Electro-Motive Diesel, Inc. Coupling mechanism
US11892079B2 (en) * 2019-08-22 2024-02-06 Sick Ag Process connection having an annular gasket

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3307157B2 (en) * 1995-04-28 2002-07-24 三菱自動車工業株式会社 Fuel injection pipe introduction device
JPH09324896A (en) * 1996-04-02 1997-12-16 Hino Motors Ltd Oil seal device for injection pipe
JP2010164184A (en) * 2009-01-19 2010-07-29 Nippon Soken Inc Seal structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190145518A1 (en) * 2017-11-16 2019-05-16 Electro-Motive Diesel, Inc. Coupling mechanism
US11892079B2 (en) * 2019-08-22 2024-02-06 Sick Ag Process connection having an annular gasket

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